Table for grinding apparatus



Aprfl 14, 1931. H; L. KEHL TABLE FOR GRINDING APPARATUS Filed April 2,1929 4 Sheets-Sheet 1 INVENTOR April 1 W31.

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H.L.KEHL

TABLE FOR GRINDING APPARATUS Filed April 2, 1929 4 Sheets-Sheet 2April'M, 1931. H. L. KEHL TABLE FOR GRINDING APPARATUS Filed April 2.1929 4 Sheets-Sheet 3 INVEiifOR April 14, 1931. H. LQKEHL TABLE FORGRINDING APPARATUS Filed April 2. 1 29 4 Sheets-Sheet 4 :o M GE.

Patented Apr. 14, 1931 UNITED STATES PATENT oFFica HENRY I! KEHL, OFPITTSBURGH, PENNSYLVANIA, ASSIGNOR TO J ONES & IQAUGHLIN STEELCORPORATION, OF PITTSBURGH, PENNSYLANVIA, A CORPORATION OF PENN-SYLVANIA TABLE FOB GRINDING APPARATUS Application filed April 2, 1929.Serial No. 351,848.

This invention relates generally to tables for feeding bars to grindingapparatus and receiving the ground bars from the grinding apparatus. Itrelates more particularly to 5 tables of the character above referred toin which the bars are fed to and delivered from the grinding apparatusautomatically. The

bars are given a rotating and forward movement before entering thegrinding apparatus, and the speed of this movement is substantiallyequal to that imparted to the bars by the regulating wheels of thegrinding apparatus.

In tables of the general types referred to and which have been usedheretofore, rotation of the bars before entering the grinding apparatushas been imparted by hand.

WVhen the hand method is employed it is necessary to overcome theinertia of the bars in bringing them up to the proper grinding speed. IVhile the bars are attaining the proper grinding speed the grindingapparatus acts unevenly on the bars resulting in flat spots and areduced diameter of the bars adjacent their ends.

In devices heretofore in general use no means has been provided formaintaining the forward and rear ends of the bars in proper alignmentwith the grinding apparatus. If the ends of the bars are out ofalignment, the bars strike the face of the grinding wheel at an angleand cause a reduction in the diameter of the bars. For example, a bar-20feet long having its free end 1/32 of an inch out of line with the endof the bar in contact with the grinding apparatus reduces the diameterof the bar about 5/10000 of an inch at the edge of a grinding wheelhaving a 4 inch face.

In devices heretofore in use when it becomes necessary to operate uponbars of a different size, it has required a great deal of time to makethe necessary adjustments of the guides and means for rotating the bars.

4 All of these disadvantages are overcome by my invention. In accordancewith one form of the present invention, the bars are fed to the grindingapparatus by means of rotating conical discs contacting with the bottomsof the bars. All of. the discs along the tables are rotated from acommon drive shaft which rotates the discs at the. same speed. Thecenter line of the discs are slightly out of alignment with the centerline of the bars.

This arrangement not only rotates the bars around their own aXes butalso imparts a longitudinal movement thereto. The speed of the rotatingconical discs is such that the speed of the bars as they-enter thegrinding apparatus is substantially equal to that 1111-,

parted by the regulating wheels of the grinding apparatus. In thismanner the inertia of the bars is overcome before the bars enter thegrinding apparatus. The whole length of the bar is therefore subjectedto a uniform grinding action resulting in the bar having an evendiameter throughout its length. r

The forward and rear ends of the bars are hand. The provision of thepinions and racks insures proper alignment of of the bars.

The necessary adjustments for operating upon different sized bars isaccomplished by rotation of a handwheel. The hand wheel the ends issecured to a shaft extending "the length of the table and has bevelpinions secured there to which mesh with bevel pinions secured to anoppositely threaded screw. Rotation of the screw moves the guides in ahorizontal I direction. Movement of the guides in a horizontal directionautomatically causes the conical discs which rotate thebars to be movedupwardly or downwardly so as always to maintain the center line of thebars in the proper grinding relationship.

In theaccompanying drawings which illustra-te the present preferredembodiment of my invention;

Figure 1 is a diagrammatic representation of the whole apparatus,

Figure 2 is a plan view of the feedtable, Figure 3 is an elevation ofthe feed table, Figure 4 illustrates the adjusting mecha? Figure 9 isanend view'of a guide for guiding the bars along the table. 7

Referring to Figure 1, there is shown a feed table 2 which delivers thebars A to a grinding apparatus 3. The ground bars are received from thegrinding apparatus on a receiving table 4. The bars are delivered to thefeed table 2 from a, rack 5 by means of the arms 6 mounted on a shaft 7.After hemg ground and received upon the receiving .table 4 the. bars aretransferred from the receiving table to a rack 8 by arms 9 mounted: on ashaft 10.

a The means for maintainin the ends of the b c. n

, i l t i bars in alignment is il us rated in Figures 2, 3'and, 5. Thetable is mounted on wheels 12 running on guide tracks 13 secured tosupports 14. One of the wheels 12 at'each end of the table carries atorsion shaft 15 which extends the length of the table. Pinions 16secured to each end of the torsion shaft mesh with racks 17 carried bythe supports 14; The tableis movedasideways by means of :its attachmentto a part of: the

grinding'apparatus which" is operated byhand. The provision ofthe'pinions 16 and racks 17 insures that the ends of-the bars will bemaintained in alignment The bar, is'f'edalong the table and is 1'0 tatedabout its axis by means of conical discs -18 whichcontact with thebottomyof the bar.

These conical discs are spaced along the length of the table and aredriven through a drive shaft 19 as illustrated in detail in Figure 7.The drive shaft (Figure 3) is driven by a motor 20through Va'chainc21and sprocket wheel 22. Y The drive shaft 19 has a bevel pinion 23secured thereto-by a setscrew 24. V The pinion 23 drives a pinion 25secured to ail-outer spindle 26. The outer spindle carries an innerspindle 27 therein, the outer and inner spindles beingconnected by a key28; The inner spindle may be moved upwardlyand downwardly to adjust itfor different sized bars, by means hereinafter described. The head 29ofthe inner spindle has ajscrew threaded opening for the reception of ascrew threaded shank 30 oftheconical disc 18. Theprovis ion of a screwthi'ead ed shankon the conical disc enables the discs to be changedwithout changing .the inner spindle 27.

As shown in Figure'8 the disc 18 and the'bar'A is such that thecenterline '32ofithedisc does not coincide with the centerline33of the bar. Bythis men-gethe arrangement of ment, when the conical discs 18 arerotated they not only cause the bar A to rotate about its axis, but alsoimpart longitudinal movement to the bar, causing it to be fed toward thegrinding apparatus. 9

along the table 2 by guides 35 which are threadedinto cross slides 36.The cross slides are guided in'ways 37 provided in the guide heads 38.The guide heads 38 are secured to pipes 39 carried by the table. A screw41 having oppositely threaded ends is threaded into each cross slide 36.Each screw 41 has a bevel'pinion 42 secured thereto by a set screw 43.The pinion 42 is rotated by a pinion 44. Pinions 44 are spaced along theshaft 45 which extends the length ofthe table. The shaft 45 is rotatedby a hand wheel 46. Upon rotation of the hand'wheel, each screw-41 isrotated; As the ends of-the screws are oppo sitely threaded, the crossslides 36 and the guides 35 are caused-to move toward or'awayfromeachgother. Adjustment of theguides '35 relative to the cross slides-36is-. accomplished by screwing the guides 35 into the cross slides.This is conveniently accomplished by inserting a spanner intothe=openings 47.. and rotating the guides.

. When the guides 35 are Inovedtoward each other in order to operateupon bars of smaller; size, the conical discs 18 are simultaneously?moved upwardly an equal distance in orders to maintain the center of thesmaller bar in the same plane that theaxis of the larger bar occupied.Thisis necessary in order'to main-m tain correct relationship betweenthe bar and,

the grinding'apparatusj This upward move;-:

ment of the conical discs 18 when'the guides 35, are moved toward eachother is accomplished by the following mechanism. 1 A pin. 48 (Figure 4)is screwed into one of the cross slides 36. "Theopposite-end of the.pin48 is,

connected to one end of1a connecting rod .49.

The opposite end of the r0d'49 is formed ina' yoke 50, whichis pivotallyconnected bya pin: 51 to a lug-52 on a camr53 rotatable aboutthe pipe39. VVhenthe guides 35'are moved toward each other theconnecting rod 49rotates the cam 53 about the pipe 39. I The inner endof the cam 53carries an arm 55; As the arm 55 moves upwardly-. (Figure 7) it'raisesan arm 56 carried by a sleeve 57 surrounding the outer spindle 26; Thesleeve 57" is slidable upwardly and downwardly-in the casing 58.- Upwardmovementof the arm 56 raises the 7 sleeve 57; Asthe sleeve is raisedit'raises the" inner spindle 27 inthe outer' spindle'26. N0

matter what the {position of the" inner and outer spindle's'may betheinner 'spin'dle is caused-to rotate with the outer spindle-he cause of'the'ke'y'28. By this arrangement,

movement of the guides 35 inwardly in, order to operate uponsmaller'sizebars autoineti- Thefadyustmg IIIGChflHISIIl, for operatingupon'difierent'sizedv-b'ars is shown in detail in Figures 4, 6, 7, and8. The bar is guided Fill cally raises the conical discs 18, therebymaintaining the axis of the different sized bars in the correctrelationship with the grinding apparatus.

The ratio of rotation of the bars about their axes to the movement ofthe bars longitudinally may be changed by varying the distance at whichthe bars are set off the center line of the conical discs 18. Thischange in the ratio of rotation to advancement of the bars isaccomplished by screwing the guides I have illustrated and described thepres ent preferred embodiment of my invention. It is to be understoodhowever that the invention may be otherwise embodied within the scope ofthe following claims.

I claim:

1. Apparatus for feeding bars to a grinding machine, comprising a table,means for feeding a bar along the table, supports for the table, andracks mounted on the supports and extending transversely of thedirection of feed, said table having pinions cooperating with saidracks.

2. Apparatus for feeding bars to a grinding machine, comprising a table,means for feeding a bar along the table, supports for the table, racksmounted on the supports and extending transversely of the direction offeed, guide rails mounted on the supports, guide wheels supported by theguide rails, the guide wheels carrying the table, and pinions carried bythe table and adapted to cooperate with said racks.

3. A feed table for bars, comprising a conical disc arranged to rotateand cause longitudinal movement of a bar, by contact of the bar at theconical surface of the disc, the disc having a disc spindle, an outerdriving spindle in which the disc spindle is axially slidable, a keyconnecting the disc spindle and the outer driving spindle, and means forrotating said last named spindle.

4. A feed table for bars, comprising a conical disc arranged to rotateand cause longi' tudinal movement of a bar, the disc having a spindle,an outer driving spindle, a key connecting the disc spindle and theouter driving spindle, means for rotating said last named spindle andmeans for adjusting the disc longitudinally of its axis.

5. A table for feeding bars, comprising side guides movable toward andaway from each other, a support for a bar, and means connecting the sideguides and support for raising the support as the side guides are movedtoward each other. i

6. A tablefor feeding bars, comprising side guides movable toward andaway from each other, a supportfor a bar, a cam operable to raise thesupport, and means connecting one of the guides and, the cam forraisingthe support as the side guides are moved toward each other. i i

7 A feed table comprising side guides movable toward and away from eachother, a rotatable disc adapted to support and rotate and feed a baralong the table, the disc having a spindle, a'driving spindleoperatively connected. to the disc spindle, the disc spindle and drivingspindle being relatively movable, means for rotating the drivingspindle, and means operable upon movement of the side guides toward eachother forraising the disc. i 8. A feed table comprising side guidesmovable toward and away from each other, a rotatable disc adapted tosupport and rotate and feed a bar along the table, the disc having aspindle, a driving spindle operatively connected to the disc spindle,the disc spindle and driving spindle being relatively movable, a sleevesurrounding the driving spindle and supporting the disc, means ope'r-rable upon movement of the side guides toward each other for raising thesleeve, and means for rotating the driving spindle.

9. A table for feeding bars, comprising side guides supported by crossslides, an oppositely threaded screw threaded in the cross slides, meansfor rotating the screw to move the slides toward and away from eachother, a conical rotatable disc supporting a bar and rotating it andfeeding it along the table, means connecting one of the slides and thedisc and operable on movement of the slides toward each other forraising the disc, and means for rotating the disc.

10. table for feeding bars, comprising side guides supported by crossslides, an opposltely threaded screw threaded in the slides, means forrotating the screw to move the slides toward and away from each other, aconical rotatable disc supporting a bar and rotating it and feeding italong the table, a cam operable to raise the disc, a rod connecting thecam and one of the slides, and means for rotating the disc.

11. A table for feeding bars, comprising side guides supported by crossslides, a rotatable disc adapted to support abar and rotate it andfeedit along the table, the center line of the disc and the center lineof the bar being offset, means for rotating the disc, and means operableon movement of the slides toward each other for raising the disc,whereby the axes of bars of different sizes are maintained in the sameposition, said guides being adjustable in their slides in order to varythe the disc.

"129A; table-for feeding bars, comprising a plurality of rotatable.discs for rotating and feeding a barvalong'thetable, a plurality of sideguides spaced along each" side of, the

tab1e means for adjusting the side guides inunison, toward the uides onthe opposite side of the table and means operable on movement of theguides toward each other for raising the discs. r

l3.Apparatus of the character described, comprising a grinding machine,a table for feeding bars thereto, and a'table' for receiving barsfromthe grinding machine, said tables havlng rotatable conical discs ar-7 ranged to support and rotate and feed a bar;

along the table, said discs, being connected to-a common drive shaftwhereby the bar is automatically fed through the grinding ma- Intestimony whereof I havehereunto set myihand. 7

V HENRY- L. KEHL.

